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Api Endpoint

JSON Schema Validator

Validate a JSON value against a JSON Schema and coerce common LLM-output mistakes (numbers as strings, stringified booleans, scalars where arrays are expected, missing defaults, extra properties). Returns the coerced value plus a structured error report. Built for cleaning up LLM tool-call arguments and structured outputs. POST a JSON body like: {"schema":{"type":"object","required":["name","age"],"properties":{"name":{"type":"string"},"age":{"type":"integer"}}},"data":{"name":"Ada","age":"36"}}

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Offering

Provider
keyronne.com
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Development
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://keyronne.com/api/validate-json
MIME type
application/json
First seen
2026-10-16T01:50:14.534Z
Last seen
Tags
JSON, Validation, llm-outputs, coercion, schema

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.001 USDC
Atomic price: 1000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "payTo": "0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4"
  }
]

Observed health

Status
Healthy
Latest latency
93 ms
Average latency
135 ms
HTTP status
204
Last checked
Reachability
100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json"
      ]
    },
    "body": {
      "type": "object",
      "required": [
        "schema",
        "data"
      ],
      "properties": {
        "schema": {
          "type": "object",
          "description": "JSON Schema (draft-07 style subset: type, properties, required, items, enum, const, additionalProperties, min/max constraints, pattern, default)."
        },
        "data": {
          "description": "The candidate JSON value to validate and coerce."
        },
        "coerce": {
          "type": "boolean",
          "default": true,
          "description": "Attempt type coercion and default-filling before validating."
        }
      }
    }
  }
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "properties": {
        "body": {
          "properties": {
            "coerce": {
              "default": true,
              "description": "Attempt type coercion and default-filling before validating.",
              "type": "boolean"
            },
            "data": {
              "description": "The candidate JSON value to validate and coerce."
            },
            "schema": {
              "description": "JSON Schema (draft-07 style subset: type, properties, required, items, enum, const, additionalProperties, min/max constraints, pattern, default).",
              "type": "object"
            }
          },
          "required": [
            "schema",
            "data"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "type": "object"
    },
    "output": {
      "properties": {
        "errors": {
          "items": {
            "properties": {
              "message": {
                "type": "string"
              },
              "path": {
                "type": "string"
              }
            },
            "type": "object"
          },
          "type": "array"
        },
        "valid": {
          "type": "boolean"
        },
        "value": {
          "description": "The (possibly coerced) value."
        },
        "warnings": {
          "items": {
            "properties": {
              "message": {
                "type": "string"
              },
              "path": {
                "type": "string"
              }
            },
            "type": "object"
          },
          "type": "array"
        }
      },
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}